问题
I am trying to achieve a web PHP program that will display data from a records in a MySQL database in a HTML form. I have a couple of navigation buttons that I wish to cycle to the next and previous records in the database.
My problem is, I can't seem to cycle back and forth through the records. mysql_fetch_assoc just gets one row or is only good when it comes to a while loop.
Any help would be appreciated! This is what I have so far...
$page = intval($_GET['page']);
$limitStart = $page - 1;
if($limitStart < 0) {
$limitStart = 0;
}
$query = "SELECT caleadID, region, siteaddr1, siteaddr2, siteaddr3, siteaddr4, sitepcode, ";
$query .= "addgennotes, description, value, award, awardaddr1, awardaddr2, awardaddr3, awardaddr4, awardpcode, ";
$query .= "phone_number, fax_number, fldAwardedWebsite, fldAwardedEmail, contact_name, date FROM tblTradesman_Awarded WHERE 1";
$query .= ' LIMIT ' . $limitStart . ',2';
$result = mysqli_query($connection, $query);
confirm_query($result);
$result_array = array();
while($row = mysqli_fetch_assoc($result)) {
$result_array[] = $row;
}
if(intval($page) === 0) {
$previousRecord = NULL;
$currentRecord = $result_array[0];
$nextRecord = $result_array[1];
} else {
$previousRecord = $result_array[0];
$currentRecord = $result_array[1];
$nextRecord = $result_array[2];
}
if($previousRecord) {
}
if($nextRecord) {
}
?>
<?PHP
$caleadID = $currentRecord['caleadID'];
$region = $currentRecord['region'];
$siteaddr1 = $currentRecord['siteaddr1'];
$siteaddr2 = $currentRecord['siteaddr2'];
$siteaddr3 = $currentRecord['siteaddr3'];
$siteaddr4 = $currentRecord['siteaddr4'];
$sitepcode = $currentRecord['sitepcode'];
$addgennotes = $currentRecord['addgennotes'];
$description = $currentRecord['description'];
$value = $currentRecord['value'];
$award = $currentRecord['award'];
$awardaddr1 = $currentRecord['awardaddr1'];
$awardaddr2 = $currentRecord['awardaddr2'];
$awardaddr3 = $currentRecord['awardaddr3'];
$awardaddr4 = $currentRecord['awardaddr4'];
$awardpcode = $currentRecord['awardpcode'];
$phone_number = $currentRecord['phone_number'];
$fax_number = $currentRecord['fax_number'];
$fldAwardedWebsite = $currentRecord['fldAwardedWebsite'];
$fldAwardedEmail = $currentRecord['fldAwardedEmail'];
$contact_name = $currentRecord['contact_name'];
$date = $currentRecord['date'];
?>
<div id="tradesmen_data">
<div id="primary">
<label for="caleadID">Tradesman Lead ID: </label>
<input type="text" name="caleadID" value="<?PHP echo $caleadID ?>" />
<label for="value">Job Value GBP: </label>
<input type="text" name="value" value="<?PHP echo $value ?>" />
<label for="date">Tradesman Publish Date: </label>
<input type="text" name="date" value="<?PHP echo $date ?>" />
</div>
<div class="columns">
<fieldset id="Site">
<legend>Site Details</legend>
<dl>
<dt><label for="siteaddr1">Site Address: </label></dt>
<dd><input type="text" name="siteaddr1" value="<?PHP echo $siteaddr1 ?>" /></dd>
</dl>
<dl>
<dt><label></label></dt>
<dd><input type="text" name="siteaddr2" value="<?PHP echo $siteaddr2 ?>" /></dd>
</dl>
<dl>
<dt><label></label></dt>
<dd><input type="text" name="siteaddr3" value="<?PHP echo $siteaddr3 ?>" /></dd>
</dl>
<dl>
<dt><label></label></dt>
<dd><input type="text" name="siteaddr4" value="<?PHP echo $siteaddr4 ?>" /></dd>
</dl>
<dl>
<dt><label for="sitepcode">Postcode: </label></dt>
<dd><input type="text" name="sitepcode" value="<?PHP echo $sitepcode ?>" /></dd>
</dl>
<dl>
<dt><label for="region">Region: </label></dt>
<dd><input type="text" name="region" value="<?PHP echo $region ?>" /></dd>
</dl>
<dl>
<dt><label for="addgennotes">General Notes: </label></dt>
<dd><textarea rows="4" cols="30" name="addgennotes"><?PHP echo $addgennotes ?></textarea></dd>
</dl>
<dl>
<dt><label for="description">Description: </label></dt>
<dd><textarea rows="4" cols="30" name="description"><?PHP echo $description ?></textarea></dd>
</dl>
</fieldset>
</div>
<div class="columns">
<fieldset id="Contractor">
<legend>Contractor Details</legend>
<dl>
<dt><label for="award">Awarded To: </label></dt>
<dd><input type="text" name="award" value="<?PHP echo $award ?>" /></dd>
</dl>
<dl>
<dt><label for="awardaddr1">Address: </label></dt>
<dd><input type="text" name="awardaddr1" value="<?PHP echo $awardaddr1 ?>" /></dd>
</dl>
<dl>
<dt><label></label></dt>
<dd><input type="text" name="awardaddr2" value="<?PHP echo $awardaddr2 ?>" /></dd>
</dl>
<dl>
<dt><label></label></dt>
<dd><input type="text" name="awardaddr3" value="<?PHP echo $awardaddr3 ?>" /></dd>
</dl>
<dl>
<dt><label></label></dt>
<dd><input type="text" name="awardaddr4" value="<?PHP echo $awardaddr4 ?>" /></dd>
</dl>
<dl>
<dt><label for="awardpcode">Postcode: </label></dt>
<dd><input type="text" name="awardpcode" value="<?PHP echo $awardpcode ?>" /></dd>
</dl>
<dl>
<dt><label for="phone_number">Telephone: </label></dt>
<dd><input type="text" name="phone_number" value="<?PHP echo $phone_number ?>" /></dd>
</dl>
<dl>
<dt><label for="fax_number">Fax: </label></dt>
<dd><input type="text" name="fax_number" value="<?PHP echo $fax_number ?>" /></dd>
</dl>
<dl>
<dt><label for="fldAwardedWebsite">Website: </label></dt>
<dd><input type="text" name="fldAwardedWebsite" value="<?PHP echo $fldAwardedWebsite ?>" /></dd>
</dl>
<dl>
<dt><label for="fldAwardedEmail">Email: </label></dt>
<dd><input type="text" name="fldAwardedEmail" value="<?PHP echo $fldAwardedEmail ?>" /></dd>
</dl>
<dl>
<dt><label for="contact_name">Contact Name: </label></dt>
<dd><input type="text" name="contact_name" value="<?PHP echo $contact_name ?>" /></dd>
</dl>
</fieldset>
<?PHP
$contact_made = true;
if ($contact_made) {
echo "<div id=\"contact_made\">";
echo "Contact has been made";
echo "</div>";
}
?>
</div>
<div class="clear_float"></div>
</div>
<div id="tradesmen_data_navigation">
<a href="#"><input type="submit" name="previous" value="Previous Record" /></a>
<a href="#"><input type="submit" name="view_lead" value="Generate Lead" /></a>
<a href="#"><input type="submit" name="next" value="Next Record" /></a>
</div>
回答1:
The code is untested, but it should point you into the right direction.
The GET parameter page controls which section of the result set to show as you set the LIMIT of the query using the value of page.
You select the current record from DB as well as the previous and the next. This way, you know if you can generate a link to the next/previous record in your application.
$page = intval($_GET['page']);
$limitStart = $page - 1;
if($limitStart < 0) {
$limitStart = 0;
}
$query = "SELECT caleadID, region, siteaddr1, siteaddr2, siteaddr3, siteaddr4, sitepcode, ";
$query .= "addgennotes, description, value, award, awardaddr1, awardaddr2, awardaddr3, awardaddr4, awardpcode, ";
$query .= "phone_number, fax_number, fldAwardedWebsite, fldAwardedEmail, contact_name, date FROM tblTradesman_Awarded WHERE 1";
$query .= ' LIMIT ' . $limitStart . ',3';
$result = mysqli_query($connection, $query);
confirm_query($result);
$result_array = array();
while($row = mysqli_fetch_assoc($result)) {
$result_array[] = $row;
}
if(intval($page) === 0) {
$previousRecord = NULL;
$currentRecord = $result_array[0];
$nextRecord = $result_array[1];
} else {
$previousRecord = $result_array[0];
$currentRecord = $result_array[1];
$nextRecord = $result_array[2];
}
if($previousRecord) {
$prevPage = $page - 1;
if($prevPage < 0) {
$pagePage = 0;
}
echo '<a href="index.php?page=' . $prevPage . '">previous</a>';
}
if($nextRecord) {
echo '<a href="index.php?page=' . ($page + 1) . '">next</a>';
}
回答2:
Iterate through your array.
By returning mysqli_fetch_assoc you effectively return a single row.
while($row = mysqli_fetch_assoc($result)) {
$returningRows[] = $row;
}
return $returningRows;
来源：https://stackoverflow.com/questions/22608132/how-to-cycle-through-mysql-rows